Surgical bone-cutting device



Feb@ 12 J. A. HEIDBRINK SURGICAL BONE CUTTING`DEVIGE vFiled April 21 .ZK/VEN TOR: JAY A. HE/DBRINK. BY Q1 J A TToR/vs YS.

Patented Feb. 12, 1924.

UNITED STATES JAY A. HEID'BRINK, or MINNEAPOLIS, MINNESOTA.

1,483,085 PATENT joFfFllcE.

SURGICAL Bonn-CUTTING nEvIcE.z f

' Appncation flied Aprn21, 1921. serial No. 463,421. .i

To all whom t may concern:

Be it known that I, JAY A. HEIDBRINK, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful. Improvements in Surgical Bone-Cutting Devices, of which the follow.-k ing is a specification.

My invention relates to surgical ibonecutting devices, and an object is to provide a device for causing a rapid succession of blows to be delivered upon a cutting .tool

which is in engagement with the bone being operated upon. My device may be employed a in performing surgical operations upon bones in various parts of the body. A particular instance where `it may be employed to advantage is in oral surgery in cases .of impacted teeth. Heretofore in treating such cases,` it has been customary to drill into,

theV jawbone with a drill of. the kind used by dentists. Such practice is objectionable among other reasons because the fine particles which are drilled out get into the tis-k sues and this is liable to be followed by injurious results especially Iin cases where the bone is diseased. An object of my inventionr is to eliminate this objection by providing a cutter which cuts into the bone without producing ne particles. Another object isl to provide a device of this lcharacter which may be readily attached to vand operated byl customary dental engines now in use.

`The full objects and advantages .of my invention will appear in connection `with the detailed description, and the novel fea-4 tures embodied in my inventive idea will be.

particularly pointed out in the claims.

In the accompanying drawings which illustrate one embodiment of/my invention,-

Fig. 1 'is a side elevational view of the device. Fig. 2 is a view mostly'in central` longitudinal section. Fig. 3 is a view in sectional elevation showing the device operated to bring the parts into a dierent position from that shown in Fig. 2. Fig. 4 is a view in cross section on the line 4.-4 of Fig. 8. Fig. 5 is a view in cross-section on the line 5-5 of Fig. 3. Fig. 6 is a view in cross-section on the line6-6 of Fig. 3.

Referring to the particular construction shown in the drawings, the numeral 10 designates the customary toolesupporting or handle member of a dental engine which carries a shaft driven by the usual beltpulley 12. My device is adapted to be attached to the memberlO yand driven from the shaft-contained therein, and the preferableconst-ruction will now be described. A cylindricalfmember 14is provided at its rear end with external screw threads for engagement by internal threads formed in a flange 16 extending .from a` member18 which has a bore for rotatablyireceiving ashaft 20, the reduced -rear portion of which` extends through a socket portion. 22 of the member 18 and has an end 23 which is shaped for engagement with the forward end of the shaft contained in the member 10 when the latter is placed in the socket member 22 which is split for a portion of its length as indicated at 24. A clampingl sleeve 26 provided with an inclined surface is threaded upon the member' 18 so thatfwhen the member 10 is inserted in the socket it will be securely held therein upon turning the sleeve. The forward end of the cylinder 14 is provided with a shouldered interiorly threaded section 28 Vfor engagement with a head member 30 which hasfa bore for slidably receiving thereduced ,portion-32 of a holder for holding a chisel or other cutting tool 34. The lforward end of this tool vholder is threaded for receiving an adjustable stopring 36. The rear portion of the tool holder has anenlarged portion 38 which forms a stop-shoulder. 40 for engagement with the wall contained in the head member 30. The tool holder at therear of the enlarged portion38has a still further enlarged portion 42. .Extendingrearwardly from the section 2,8 `within the cylinder: is a ksleeve 44 within which is slidably mounted a hammer mem ber having a head 46 and ashank 48 which extends slidably through a collar 50. This collar is held in fixed position by the sleeve 44 and a sleeve 51. Beyond the collar the shank is provided with an enlarged portion 52 andfsurrounding the shank between the head 46 andthe collar 50 is astiif coiled spring 54.. Attached tothe portion 52 is a semicylindrical member. 56 upon which is mounted a roller 58 'which rests upon the cam surface of a member 60 carried by the'forwardl endI of the shaft v20. Theshaft 20 is held upfto its place by a rod 62..having a thrust-bearing end engaging the front face of the member 60. The rod extends throughk by the rear ends of a pair of springs 66., the forward ends of which are'astened in lugs 68 carried by the member 42. 66 normally hold the `tool 3 4 forwardly as shown in Fig. 2 but wl'ien it is pressed against a bone the tool is pushed backslightly as shown in Fig. 3 in order that it may be subjected to a hammering action. a

The operation and advantages of my invention will be'apparent from. the forego-y ing description.. The hammer 'head 46 is normally -held forwardly bythe spr-ing '54.. then the dental 'engine is operated toV rot-ate the shaft .20' the Arotation o'l` the :am on account .of its engagement withthe roller 58 lifts the hammer andcauses the spring'il to be compressed as shown in Fig. 3. .NVhen the high place vof the cam surface runs ofi the roller, the action of the spring causes the hammer to strike asharp blow on the enlarged portion `orf the. .tool holder, and, on account of the speed at which the .dental engine is.

fiperated,. this action causes a rapid succession of blowsv toibe rdelivered npon the cuttingtool. In thisr maimertihe- `bone is sub-J jeeted toa cutting operati-on which isspeedilly accomplished without the tine .particles which are vproduced when a drill for saw is employed. holder is backed .np fresi-liently, the forceoif the blow delivered thereon Abythe han'nner4 is determined 'by 'the idegree yoi' .pressure with which .the tool is pressed against the bone.

I claim: v n .v l. A surgical bone-cutting devicecompri-sing a hol-der for a cutting tool, a ytubular member which receives anenlarged portion of 'said holder, a headhsecured to the iorward .end osaid tubular member .and havingV a bore through which reduced-.portion ofwsaid .holder extends 'slide-bly, a stop .on

'the' forward end of said holder which lby engagement with said Vhead limits-rearward moi-rement of said holders, a shaft-supporting member secured to. .the rear end ot said tnbnlar member, means for attachingk `said shaft-supporting member to the handle member .of :dent-al engine, .a shaft vin said shaft-supporting member Yadapted for operation .by the dental engine, a cam on the forward end of said shaft, a collar fixed in intermediate .position :in said .tubular mem.-

ber, a shank :extending slidably through said collarand having an enlargement on :its rear end, .af-hammer head in the forward end of said shank, a coiled spring surrounding said shank "between said hammer headv andsaid collar, a roller `carried `by the rear The springs It` isobvions that sincethe tool of said shank and adapted to beforced rearwardly by the, rotation of said. cam, a xed pin extending through a slot in said hammer head, and resilient means interposed between said pin and the rear of said tool holder.

2. A surgical bonecutting device comprising a holder for a cutting tool, a tubular member which receives an enlarged portion of said holder, a head secured to the forward end of said tubular member and having a bore through which a. reduced portion of said yholder extends slidably, an adjnstablestop-ring on .the forward end of said' holder'which by engagement with said head: limits rearward movement of said holder, a Shah-supporting rmember secured to the rear end of saidA tubular member, means for ,attaching said shaft-supporting member to the handle member of a dental engine, a shaft in said shaft-.supporting member adapted for operation Aby the ydental engine, a cam on the forward end ofsaid shajit, a collar yfixed in intermediate position in said tubular member, a shank extending slidably through said collar and having an enlargement on its rear end, `a hammer head on the forward end of said shank, a coiled spring surrounding said shank between said hammer head and said collar, a rear-ward extension on said enlargement, a Aroller mounted on said extension and adapted vto be forced rearwardly by the rotation .of said cam, a lined `pin extending through .a slot :in said hammer head, a rod extendingv rearward from .said pin and engaging `the front face of ysaid cam, and resilient means interposed between and the. rear of said tool holder.

3. A surgicalbone-cutting device comprising a holder for a cutting tool, a lmemliier adapted to be held in the hand off the operator and which receives a portion of ysaid tool holder, vresilient means which normally urges said holder forwardly with relation t-o lsaid .tubular member yand which permits Said holder to be pushed rearwardly .when it is pressed against the bone to be cut, means for attaching said ymember to the handle portion of a dental engine, a hammer in said member, a spring normally urging said hammer forwardly, and means adapted to ybe operated 4repeatedly by the dental engine for retracting and vreleasing said hammer whereby said spring causes said hammer toy deliver ,a succession of blows upon saidtool holder.

In testimony whereof I hereunto aix my said pin 

